Can Guinea Pigs Eat Ketchup?

Ketchup is a fantastic food to have and is incredibly popular in the UK at least. We love it in our house, with myself and our 3 kids having it almost daily with our meals. In fact its only my wife who doesn’t like it.

So if, most of my family like it, can our guinea pigs eat ketchup, and if they can how much can they eat of it?